Current Sensing Amplifiers

Current sensing amplifiers measure current by outputting a voltage that is proportional to the flowing power current. A resistor is used to convert the load current to a small voltage which is then accurately amplified. They offer real-time overcurrent protection.

What are the different applications of current sensing amplifiers?
Accurate current sensing is crucial to optimising performance in a range of applications, such as motor control and power management. In devices where battery or power-line monitoring is highly necessary, like laptops and phones, current sensing amplifiers are critical.

How to choose the right type of current sensing amplifier
There are several factors that will determine the the type of amplifier you choose, including whether the measurement will be on the high or low side. The sense resistor can be placed either between the supply voltage and load, or between the load and ground. The former is called high-side seinsing, whereas the latter is called low-side sensing. High voltage current sensing amplifiers offer input ranges up to +76V and down to -20V, ideal for applications such as motor control and network routers. Low power current sensing amplifiers help to maximise and extend battery life.

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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Minimum CMRR Number of Channels per Chip Output Type Maximum Supply Current Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 796-8912
Mfr. Part No.AD8211YRJZ-R2
£2.166
Each (In a Pack of 5)
Units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 121-9269
Mfr. Part No.INA219BIDCNT
£1.441
Each (On a Reel of 250)
Units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 829-1544
Mfr. Part No.TSC1021BIYPT
£1.146
Each (In a Pack of 5)
Units
Single - - 90dB 2 Analogue 450 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V dc
RS Stock No. 168-8082
Mfr. Part No.TSC1021BIYPT
£0.465
Each (On a Reel of 4000)
Units
Single - - 90dB 2 Analogue 450 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V dc
RS Stock No. 820-9397
Mfr. Part No.AD8418WBRMZ
£2.088
Each (In a Pack of 5)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 732-8421
Mfr. Part No.MAX4372FESA+
BrandMaxim
£1.26
Each
Units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 920-6311
Mfr. Part No.TSC101BILT
£0.549
Each (On a Reel of 3000)
Units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 426-308
Mfr. Part No.TSC101BILT
£1.206
Each (In a Pack of 5)
Units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 145-6632
Mfr. Part No.AD8418WBRMZ
£1.597
Each (In a Tube of 50)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 817-6603
Mfr. Part No.INA282AID
£2.812
Each (In a Pack of 5)
Units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 921-2940
Mfr. Part No.INA282AID
£2.391
Each (In a Tube of 75)
Units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 165-9308
Mfr. Part No.MAX4372FESA+
BrandMaxim
£1.099
Each (In a Tube of 100)
Units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 901-3976
Mfr. Part No.Si8920BC-IP
£3.145
Each (In a Pack of 2)
Units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
RS Stock No. 761-9620
Mfr. Part No.LTC6101HVAHMS8#PBF
£4.62
Each
Units
Single 100 V - - 1 Unidirectional 0.72 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 100 V
RS Stock No. 920-9855
Mfr. Part No.NCS210SQT2G
£0.404
Each (In a Pack of 10)
Units
Single 2.7 → 26 V - 103dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 169-0204
Mfr. Part No.SI8920BC-IP
£2.822
Each (In a Tube of 50)
Units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
RS Stock No. 923-7917
Mfr. Part No.MAX4080SASA+
BrandMaxim
£1.198
Each (In a Tube of 100)
Units
- - - - - - - - - - - - - -
RS Stock No. 163-0187
Mfr. Part No.NCS210SQT2G
£0.412
Each (On a Reel of 3000)
Units
Single 2.7 → 26 V - 103dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
£3.058
Each (In a Tube of 50)
Units
Single 100 V - - 1 Unidirectional 0.72 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 100 V
RS Stock No. 545-7669
Mfr. Part No.INA198AIDBVT
£2.038
Each (In a Pack of 5)
Units
Single 12 V, 15 V, 3 V, 5 V, 9 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
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